About AD5422

Hi there,

I have some question about AD5422.
Would you give me some advice?

#1,
According to the datasheet, AD5422 has a Aversion and Bversion.
What are the differences between Aversion and Bversion.
It looks like that Bversion has a better TUE spec.
And this TUE comes from typicaldata(not max) of offset and gain error.
Is my unserstainding correct?


#2,
I found the similar product from TI.
It looks like that DAC8760 has a better specs about TUE compared to AD5422 Aversion.
But TUE is much smaller than  the total for INL+Offset+Gainerror.
I just wondered where this TUE come from.
Please check out the  attached file and give your thougnt on this.

#3,

It looks like AD5422 and DAC8760 are compatible.

Can I exchange DAC8760 with AD5422 without any change in hard ware and software?


#4,

I 'm looking at AD5422 datasheet.

But I can't find infromation about gain caliblration resister and offset calibration resister from Table 8.

Please tell me how to acsess these registers.


Best regards,

Tarzan

DAC8760TUE.pptx
  • 0
    •  Analog Employees 
    on Jul 22, 2014 1:12 PM

    Hi Tarzan,

    I will answer your AD5422 questions but we cannot comment on competitor parts or their specifications.

    #1: The AD5422 comes in two grades, A and B, the TUE of the B grade is tighter.

    TUE is calculated using the max gain error, max gain TC,max offset error, max offset TC and INL,


    #4: The AD5422 is factory calibrated out of the box, there are no user gain and offset registers.


    What users do to calibrate is use a larger range than the desired range, for example, If you wanted a 4-20mA range, use 0mA to 24mA range. It reduces the resolution but maintains accuracy.


    If anything is unclear, please let me know.


    Regards,

    David

  • Hi David,

    Thanks for your reply and approgize for my late response.

    I have one more thing to make sure.

    If  I don't use current output, How am I supposed to set the pin configration?

    Is the following setting Okay?

    Iout pin→OPEN

    Rset→OPEN

    Please let me know if there anything I should take care of .

    Best regards,

    Tarzan

  • 0
    •  Analog Employees 
    on Aug 21, 2014 7:25 AM

    Hi Tarzan,

    Yes you can leave the RSet pin and IOUT pin open circuit. You also can leave the BOOST pin open circuit.

    All other pins are set up as stated in the pin description in Table 6 of the datasheet.

    If you have any further questions, please let me know.

    Otherwise, if you have no further questions and you are satisfied that your question has been answered correctly, please choose the answer and click the "Correct Answer" button.

    Kind Regards,

    David


  • Hi DRice,

    Thanks for your prompt reply.

    I undersdand your answer.

    Of course I will click the correct answer button!!

    Best regards,

    Tarzan

  • 0
    •  Analog Employees 
    on Jan 23, 2015 9:44 AM

    Hi Alexis,

    We can only help with Analog Devices products. For the DAC8760, I'd suggest contacting TI customer support.

    Kind Regards,

    David